If the analysis continues to point to this flawed component being the cause, then 2017 isn't overly ambitious at all. They've already planned to stop using thos

If the analysis continues to point to this flawed component being the cause, then 2017 isn't overly ambitious at all. They've already planned to stop using those components, and all the telemetry shows that every other piece of the rocket continued to work fine. Notably, stage one continued to fire, and the capsule remained intact until it went over the horizon and out of radio contact. While it would have been beneficial to have better failure recovery on these cargo-only capsules, the future capsules have already been built to handle an event like this, and one of the steps in certifying it is to simulate an abort a lot like the one that happened here. So it's not really all that ambitious, once all the stuff scheduled to happen happens.